#include<stdio.h>
#include<stdlib.h>
#include<time.h>
int main()
{int jia();
int jian();
int c;
printf("加法练习请输入:1 !\n");
printf("减法练习请输入:2 !\n");
printf("返回请输入:0 !\n");
printf("\n***********************************************************\n");
printf("\n请输入练习模式!\n");
printf("\n***********************************************************\n");
scanf("%d",&c);
if(c!=0)
while(1)
{
switch(c)
{case 1:jia();break;
case 2:jian();break;
case 0:break;
default:printf("对不起!您输入有误!"); }
printf("\n请输入练习模式!\n");
printf("返回请输入:0 !\n");
scanf("%d",&c);
if(c==0)
break;}
printf("\n***********************************************************\n");
printf("\n谢谢使用!\n");
printf("\n***********************************************************\n");
return 0;
}
int jia()
{int a,b,s,t,j,i,e;
i=0;j=0;
while(1)
{srand(time(0));
a=rand()%100;
b=rand()%100;
s=a+b;
printf("%d+%d=?\n",a,b);
scanf("%d",&t);
if(t==s)
{printf("恭喜您!答对啦!\n");
i++;}
else
printf("您一不小心做错啦!\n");
j++;
printf("返回请输入:0 !\n");
printf("继续请输入:1 !\n");
e=getchar();
scanf("%d",&e);
if(e==0)
break;
}
printf("\n***********************************************************\n");
printf("\n您今天做了%d道题，其中做对了%d道题!\n",j,i);
printf("\n***********************************************************\n");
return 0;
} int jian()
{int a,b,s,t,j,i,e;
i=0;
j=0;
while(1)
{ srand(time(0));
while(a>b)
{a=rand()%100;
b=rand()%100;} s=a-b;
printf("%d-%d=?\n",a,b);
scanf("%d",&t);
if(t==s)
{printf("恭喜您!答对啦!\n");
i++;}
else
printf("您一不小心做错啦!\n");
j++;
printf("返回请输入:0 !\n");
printf("继续请输入:1 !\n");
e=getchar();
scanf("%d",&e);
if(e==0)
break;
}
printf("\n***********************************************************\n");
printf("\n您今天做了%d道题，其中做对了%d道题!\n",j,i);
printf("\n***********************************************************\n");
return 0;
}